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Celebrities love Roksanda Ilincic! The Serbian-born, London-based designer got her start in 2005, when she debuted her line in London as part of Topshop’s New Generation initiative. Ever since, her romantic-meets-edgy looks have been red carpet regulars, appearing on Dianna Agron, Kate Middleton, Gwyneth Paltrow, Keira Knightley, and more. “When I see women that I admire wearing my dresses, it gives me extra energy and this desire to be even better and to keep doing what I’m doing,” the designer told us at the British Fashion Council’s London Show Rooms event in Los Angeles. Her signature vibrant, colorful pieces, which often feature peek-a-boo cut-outs and perfect draping, can be purchased at net-a-porter.com and are also available to rent at renttherunway.com. And if you pick up one of her creations, follow her tip: “Women should follow their heart and feel comfortable in what they’re wearing,” she said. “You should feel empowered, and always add a personal touch—your own personality to the garment.” See who else loves Roksanda Ilincic’s designs in the gallery.

— Lindzi Scharf

Celebrities love Mary Katrantzou! The Greek-born, London-based designer launched her first ready-to-wear collection in 2008, and her instantly identifiable vibrant prints became a red carpet favorite ever since. “It’s flattering,” the designer told InStyle.com of seeing stars like Keira Knightley, Hailee Steinfeld, Claudia Schiffer, and Dianna Agron in her designs at the British Fashion Council’s London Show Rooms event in Los Angeles. “It makes you happy because you never have that perspective until you see the clothes on a woman. It’s always been a woman with a strong presence. It’s amazing.” Last month, her skills were recognized in a big way when the 28-year-old won the Emerging Talent Award at British Fashion Awards. Her clothes are available now at net-a-porter.com, and next year she’ll be releasing collaborations with Topshop and Longchamp. Not ready for her print power? Heed her advice: “You have to have a little bit of fun—especially with prints. We all need a little bit of color and humor in our lives. Wear it confidently.” See who else loves wearing Mary Katrantzou’s designs in the gallery.

— Sharon Clott, with reporting by Lindzi Scharf